Determine population standard deviation for average cost

Reference no: EM13119107

1. Suppose the age distribution in Sydney is as follows:

Under 18 22%
18 - 25 18%
26 - 50 36%
51 - 65 10%
Over 65 14%
Total 100%

A researcher is conducting proportionate stratified random sampling with a sample size of 250. Approximately how many people should be sampled from each stratum?

2. Candidate Hughes believes she will receive 55% of the total votes cast in her county. However, in an attempt to validate this figure, her pollster contacts a random sample of 600 registered voters in the county. The poll results show that 298 of the voters say they are committed to voting for her. If she actually has 55% of the total vote, what is the probability of getting a sample proportion this small or smaller? Do you think she actually has 55% of the vote? Why or why not?

3. The average cost of a one bedroom apartment in a town is $550 per month. What is the probability of randomly selecting a sample of 50 one bedroom apartments in this town and getting a sample mean of less then $530 if the population standard deviation is $100?

Reference no: EM13119107

Questions Cloud

Illustrate what is average emf that is induced in this coil : Illustrate what is the average emf that is induced in this coil if it is in a region where B=2.0 T upward, and the coil's plane is perpendicular to B?

State how hydrogen and covalent bonds are made : Be able to make a sketch and narrate how transcription proceeds, using the following words (more or less in order of appearance): Promoter region, RNA polymerase, template strand, coding strand, GC hairpin. Be sure to explicitly state how hydrogen..

Explain what percentage of americans earn below : What percentage of Americans earn below $20,000? What percenage of Americans earn above $ 43,000?

Find out the air temperature inside the tires at the end : At the end of the trip she measures the pressure to be 3 105 Pa. Ignoring the expansion of the tires, find out the air temperature inside the tires at the end of the trip.

Determine population standard deviation for average cost : Selecting a sample of 50 one bedroom apartments in this town and getting a sample mean of less then $530 if the population standard deviation is $100?

Explain different arrangements of the two vice presidents : The board of a pharmaceutical company has nine members. One board member will be selected as vice president of marketing, and a different board member will be selected as vice president of research

Ilustrate what is magnitude of torque about his shoulder : Ilustrate what is the magnitude of the torque about his shoulder if he holds his arm in each of the following ways? Straight out to his side, parallel to the floor.

Find probability of drawing the following card : Probability of drawing the following card. One card is drawn from an ordinary deck of 52 cards. Find the probability of drawing the following card

Explain how high above the water was she when she let go : When she lets go of the rope her initial velocity is 2.25 m/s at an angle of 35 degrees above the horizontal. If she is in flight for .616 s, explain how high above the water was she when she let go of the rope?

User Account

All Pages